2024
Effectiveness of the fourth dose of COVID-19 vaccines against severe COVID-19 among adults 40 years or older in Brazil: a population-based cohort study
Neto F, Hitchings M, Amin A, de França G, Lind M, Torres M, Tsuha D, de Oliveira R, Cummings D, Dean N, Andrews J, Ko A, Croda J, Ranzani O. Effectiveness of the fourth dose of COVID-19 vaccines against severe COVID-19 among adults 40 years or older in Brazil: a population-based cohort study. The Lancet Regional Health - Americas 2024, 34: 100755. PMID: 38737773, PMCID: PMC11087726, DOI: 10.1016/j.lana.2024.100755.Peer-Reviewed Original ResearchSevere COVID-19Cohort ACohort B.Cohort BTwo-doseMRNA vaccinesPrimary outcomeBooster dose effectivenessCOVID-19 outcomesPopulation-based cohort studyDose of COVID-19 vaccinePopulation-based cohortPopulation-based cohort of individualsCOVID-19 vaccine dosesSevere COVID-19 outcomesFollow-upCohort studyMRNA-basedVaccine doseCohort of individualsVaccine effectivenessVaccine combinationsDoseLower hazardCohort
2021
Impact of circulating SARS-CoV-2 variants on mRNA vaccine-induced immunity
Lucas C, Vogels CBF, Yildirim I, Rothman JE, Lu P, Monteiro V, Gehlhausen JR, Campbell M, Silva J, Tabachnikova A, Peña-Hernandez MA, Muenker MC, Breban MI, Fauver JR, Mohanty S, Huang J, Shaw A, Ko A, Omer S, Grubaugh N, Iwasaki A. Impact of circulating SARS-CoV-2 variants on mRNA vaccine-induced immunity. Nature 2021, 600: 523-529. PMID: 34634791, PMCID: PMC9348899, DOI: 10.1038/s41586-021-04085-y.Peer-Reviewed Original ResearchConceptsSARS-CoV-2 variantsMRNA vaccine-induced immunityT-cell activation markersSARS-CoV-2 antibodiesSecond vaccine doseVaccine-induced immunityCell activation markersT cell responsesHigh antibody titresSARS-CoV-2Vaccine boosterVaccine doseActivation markersVaccine dosesHumoral immunityAntibody titresMRNA vaccinesVitro stimulationNeutralization capacityNeutralization responseCell responsesE484KNucleocapsid peptideAntibody-binding sitesGreater reductionEffectiveness of CoronaVac among healthcare workers in the setting of high SARS-CoV-2 Gamma variant transmission in Manaus, Brazil: A test-negative case-control study
Hitchings MDT, Ranzani OT, Torres MSS, de Oliveira SB, Almiron M, Said R, Borg R, Schulz WL, de Oliveira RD, da Silva PV, de Castro DB, de Souza Sampaio V, de Albuquerque BC, Ramos TCA, Fraxe SHH, da Costa CF, Naveca FG, Siqueira AM, de Araújo WN, Andrews JR, Cummings DAT, Ko AI, Croda J. Effectiveness of CoronaVac among healthcare workers in the setting of high SARS-CoV-2 Gamma variant transmission in Manaus, Brazil: A test-negative case-control study. The Lancet Regional Health - Americas 2021, 1: 100025. PMID: 34386791, PMCID: PMC8310555, DOI: 10.1016/j.lana.2021.100025.Peer-Reviewed Original ResearchSymptomatic SARS-CoV-2 infectionSARS-CoV-2 infectionTwo-dose scheduleTest-negative case-control studyEffectiveness of CoronaVacCase-control studyHealthcare workersVariant transmissionVaccine doseFirst doseSecond doseSample collection dateSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variantsDose of CoronaVacTest-negative studiesVaccine effectiveness estimatesEffectiveness of vaccinesRT-PCR testingCase-control pairsRT-PCR testMunicipal Health SecretarySARS-CoV-2 samplesNon-pharmaceutical interventionsPeriod 14 daysUnvaccinated individuals